I believe this is the fruition of a project on the lab sub forum. Here is a recent post on the sub forum.

http://www.prosoundweb.com/community/read.php?board=3&id=153898

In which case it is a pair of Labsub / BT-7 shaped horns with a flare extension.
This should be capable of being quite scary when finished.

I don't know if you have built a proper horn with the LAB 12 yet but they are quite powerful, more so than one might expect even.

I have some measurements from Eminence on the shorted turn (flux stabilized in marketing speak) driver.
I will go through them tonight and let you know how they look.
I should have the real thing in hand shortly.
Got to run,

Tom

http://www.prosoundweb.com/community/read.php?board=3&id=153898

• horn post